<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>01、实现效果的方式方法</title>
    <style>
        div {
            position: relative;
            width: 200px;
            height: 60px;
            background: #ddd;
            filter: drop-shadow(-5px 0 0 deeppink);
        }
    </style>
</head>
<body>


<div>

</div>


</body>
</html>